My answere to this is that I cannot be sure, because I have no written documentation, but if I were a Scot and I was used to carrying a dirk all the time, I would continue to carry it wherever I went.
Many of you may remember my mentioning a good friend of mine, Dr Rob Gilbert of Stirlingshire Scotland. Sadly Robert died last year, but I remember him telling me that many a local in his community were up in arms at the law that banned the wearing of the dirk. This is much the same as the law here in NSW that bans the carrying of clasp knives in public. I have carried such a tool since I was about 8 years of age, and now at 63 they tell me I can no longer carry one in my pocket! Anyway Tom, here are a couple of images of original dirks to wet your appetite. These are both late 17th century to early 18th century style.
Copies of these are made for the Living Historian and the Historical Reenactor, but they are often left blunt for the reenactors.
Just a quick comment: You do not have to be a Scot to carry a dirk, you just have to think of a good reason as to how you came by it.